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Microsoft is beefing up its Slack-like collaboration software, Microsoft Teams, with the technology (and the founder) from collaboration software startup Chalkup. Following the acquisition, Microsoft says it will bring some of the features Chalkup had built to the Microsoft Teams for Education product experience.

Chalkup was founded in 2013 by CEO Justin Chando, who’s joining Microsoft as a result of this deal, and CTO Tim Costa, who left Chalkup in 2015.

The startup offered a classroom collaboration platform where teachers could share resources and assignments with students and could discuss course topics, among other things. The company says educators and students from 1 in 3 universities and 1 in 5 high schools in the U.S. had used Chalkup at some point.

As the two products compete in the same space – collaboration software for educators and students, both Microsoft and Chalkup realized they may do better to join forces.

“In spending time with the amazing people at Microsoft, it was clear that we were completely aligned in our mission for connecting classrooms, sparking student collaboration, and finding new and innovative ways to work together. We knew Microsoft would be a great fit and we’re thrilled for what the future holds for our customers,” said Chando, in the official announcement .

Moving forward, Chalkup says some of its best-loved features will be integrated into Microsoft Teams. However, the companies so far have only disclosed one that’s definitely making the transition: Chalkup’s criteria-based grading rubrics that let teachers give students feedback on their work.

Chalkup’s product is not immediately shutting down, as that would be disruptive in the middle of the school year. Instead, the software will remain available until June 30, 2018. It will also soon add the ability for users to export their course information and move to Microsoft Teams.

Chalkup itself was not a large company – one founder had left, and it had only raised a small seed round, according to Crunchbase. But Chalkup remained online all these years by being very capital efficient, and had built software that was in demand in the classroom, and as an acquisition target. In fact, the company had multiple acquisition offers, we understand. Investors described the exit to Microsoft as a great outcome.

“Justin built one of the first education platforms that students really loved to use,” said Baseline Ventures’ Wayne Chang, who had invested in the startup alongside Baseline’s Jeff Seibert. “And Jeff and I couldn’t be more excited that Chalkup is joining Microsoft and bringing that approach to schools and classrooms everywhere.”

The acquisition follows shortly after Microsoft Teams’ larger product received its biggest update to date. Last month, Microsoftannounced a slew of new features for its Slack competitor, including new app integrations, an app store, improved search and discovery features, and new commands.